Resin molded article

a technology of cycloolefin resin and molded parts, which is applied in the field of resin molded parts, can solve the problems of inferior durability and inferior impact resistance of products made of cycloolefin resins, and achieve excellent impact resistance, excellent oil resistance, and excellent transparency

Inactive Publication Date: 2017-08-03
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018]One aspect of the invention thus provides a resin formed article that exhibits excellent transparency, excellent impact resistance, and excellent oil resistance.

Problems solved by technology

However, since a cycloolefin resin normally has high rigidity, products made of a cycloolefin resin tend to exhibit inferior impact resistance and inferior durability against a steam sterilization treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

production example 1

[0170]A reactor was charged with dehydrated cyclohexane (500 parts), 1-hexene (0.82 parts), dibutyl ether (0.15 parts), and triisobutylaluminum (0.30 parts) at room temperature under a nitrogen atmosphere. After mixing the mixture, tricyclo[4.3.0.12,5]deca-3,7-diene (trivial name: dicyclopentadiene, hereinafter abbreviated as “DCP”) (76 parts), 8-methyltetracyclo[4.4.0.12,5.17,10]dodec-3-ene (hereinafter abbreviated as “TCD”) (70 parts), tetracyclo[7.4.0.02,7.110,13]trideca-2,4,6,11-tetraene (hereinafter abbreviated as “MTF”) (54 parts), and tungsten hexachloride (0.7% toluene solution) (80 parts) were continuously added dropwise to the mixture at 45° C. respectively over 2 hours to effect a ring-opening polymerization reaction.

[0171]The ring-opening polymerization reaction was terminated by adding butyl glycidyl ether (1.06 parts) and isopropyl alcohol (0.52 parts) to the reaction mixture. The polymerization conversion ratio of each monomer determined by analyzing the reaction mixt...

production example 2

[0176]A reaction vessel in which the internal atmosphere had been replaced by nitrogen, was charged with dehydrated n-hexane (456.1 mL) and dehydrated butyl chloride (656.5 mL). After cooling the reaction vessel to −70° C., an isobutylene monomer (196 mL) (2,425 mmol), p-dicumyl chloride (0.929 g) (4.0 mmol), and N,N-dimethylacetamide (1.22 g) (14 mmol) were added to the reaction vessel. After the addition of titanium tetrachloride (8.67 mL) (79.1 mmol) to the reaction vessel, the resulting mixture was stirred to effect a polymerization reaction at −70° C.

[0177]When 1.5 hours had elapsed from the start of the reaction, a monomer solution (including a styrene monomer (124 g) (1,194 mmol), n-hexane (23.9 mL), and butyl chloride (34.3 mL)) that had been cooled to −70° C. was added to the reaction vessel. When 45 minutes had elapsed after the addition of the monomer solution, methanol (about 40 mL) was added to the reaction vessel to terminate the polymerization reaction.

[0178]After eva...

production example 3

[0180]A styrene-based thermoplastic elastomer (2) was obtained in the same manner as in Production Example 2, except that p-dicumyl chloride was added in an amount of 1.63 g (7.0 mmol).

[0181]The styrene-based thermoplastic elastomer (2) had a weight average molecular weight (Mw) of 40,000, included a styrene block and an isobutylene block in a weight ratio of 33:67, and had a refractive index of 1.5343.

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Abstract

The present invention pertains to a resin formed article obtained by forming a resin composition that comprises a cycloolefin resin and a styrene-based thermoplastic elastomer, the styrene-based thermoplastic elastomer having a weight average molecular weight of 20,000 to 150,000, and having a difference in refractive index (ΔnD) of more than −0.002 to less than +0.002 with respect to the cycloolefin resin, the resin composition having a residual ratio of 0.10 wt % or less when analyzed based on the residue on ignition test method specified in the Japanese Pharmacopeia, the resin composition having a light transmittance (optical path length: 3 mm) of 55% or more with respect to light having a wavelength of 450 nm when the resin composition is formed in a shape of a sheet having a thickness of 3.0 mm, and subjected to light transmittance measurement, and the resin composition having a Charpy impact strength of 5 to 40 kJ/m2 when the resin composition is formed to have a thickness of 4.0 mm, a length of 80.0 mm, and a width of 10.0 mm, and subjected to the notched Charpy impact test specified in JIS K 7111-1 at 23° C.

Description

TECHNICAL FIELD[0001]The present invention relates to a resin formed article that exhibits excellent transparency, excellent impact resistance, and excellent oil resistance.BACKGROUND ART[0002]In recent years, drug containers and medical instruments made of a synthetic resin have been widely used instead of drug containers and medical instruments made of glass since they have a reduced weight, and can be safely and efficiently disposed of after use by means of incineration or the like.[0003]Drug containers and medical instruments may have a small size, or may have a complex shape. Drug containers and medical instruments are normally disposed of after use without being recycled. Therefore, it is preferable to produce drug containers and medical instruments using a raw material that exhibits excellent formability, and makes it possible to inexpensively mass-produce products having constant quality.[0004]It is considered that a cycloolefin resin is suitable as a raw material for produc...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L65/00C08J5/00C08L53/02
CPCC08L65/00C08L53/02C08J5/00C08L2203/02C08J2465/00C08J2365/00C08J2447/00C08J2347/00C08L2207/04C08L45/00C08L53/00C08G2261/3325C08G2261/418C08G2261/598C08G2261/62C08G2261/724C08F32/08
Inventor YABUKI, NOZOMISAWAGUCHI, TAICHI
Owner ZEON CORP
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